Inlet grill

ABSTRACT

An inlet grill for spraying gases with varying temperature and/or speed comprising ribs or the like variable at angle in relation to temperature and/or speed of supplied gas. Preferably the ribs comprise bimetallic elements which effect divergence of the spray angle with increased heat.

United States Patent [191 Van Der Ham Nov. 12, 1974 INLET GRILL Wim Van Der Ham, Asenvagen 7, Jonkoping, Sweden Filed: Aug. 2, 1972 Appl. No.: 277,141

Inventor:

Foreign Application Priority Data Aug. 13, 1971 Switzerland 10318/72 US. Cl. 98/40 VT, 236/49, 236/93 Int. Cl F24f 13/06 Field of Search.... 236/49, 93; 98/40 C, 40 VT,

References Cited Y UNITED STATES PATENTS 6/1923 Birdsall 236/352 2,177,194 10/1939 Whitfield 236/49 2,187,767 l/1 940 3,298,298 1/1967 3,436,016 4/1969 Edwards 236/49 Primary Examiner-William E. Wayner Assistant Examiner-William E. Tapolcai, Jr. Attorney, Agent, or FirmDorfman, Herrell and Skillman [57] ABSTRACT 9 Claims, 6 Drawing Figures W ll PATENTEHHHV 12 1974 $847,

FIGJ (PROIR ART) 2 1 F'IG.3 1. ,11 Wm H WW F'IGA FIG.6 It

INLET GRILL This invention relates to a nozzle or the like of the I kind which constitutes an inlet grill for ventilating dwelling rooms.

Ventilated rooms, for example, have in many cases, due to outside and/or inside conditions, a need for supplying air ofdifferent temperature in order to hold, for example, the room temperature constant at a desired value.

This can be established in several ways. According to one method the supply air which originally was cooled in a central unit is after-heated. According to another method induction apparatus are used such, that room air is co-ejected through cooling and; respectively, heating batteries and thereby the room is supplied with the cooling or heating effect required for maintaining the room temperature constant. According to a third method cold air and warm air are mixed in suitable proportions. When air is supplied in this way, the air of controlled temperature enters the room in the form of one or several jets which bring about a desirable agitation of the air in the room by means of a strong impulse which results in a throw length extending across the entire room or a large part thereof.

Neither at the construction nor at the installation of the nozzles inlet grills or the like through which the air is injected into the room, regard was paid to the fact that the temperature of the supply air may be different in different cases. In most cases the nozzles or grills have been designed and placed so as to be adapted for a marginal case, for example the supply of cooled air. When in such a case air of room temperature or excess temperature is supplied, the resulting throw lengths substantially exceed those obtained at a supply air of a lower temperature. The increase in speed may be up to about 50 percent. This, of course, is a inconvenience as it produces draught problems in such zones which previously were assumed not to be affected by the throw length of the supply air.

The present invention has as its object to overcome the aforesaid inconvenience and possibly other ones.

This object is achieved according to the invention in that an inlet grill of the aforesaid kind substantially is designed to have adjustable guide ribs responsive to the temperature and/or speed of the supplied ventilating medium.

Further characterizing features of the invention become evident in the following detailed description, in which reference is made to the accompanying sche- .matic drawing in which FIG. 1 shows the flow pattern for a room with conventional inlet grill at varying supply air temperature;

FIG. 2 shows the flow pattern for a room with a grill according to the invention at varying supply air temperature;

FIG. 3 shows different positions for guide blades of a grill according to the invention which are adjusted automatically in response to the supply air temperature;

In the drawing, 1 designates a room, into which a sup ply air passageway with a nozzle or inlet grill 5 opens. The dwelling zone is designated by 4.

In FIG. 1 the conventional flow pattern for supply air is shown which enters the room via a conventional grill 5 with fixed guide blades. At the inflow of relatively cold supply air a flow pattern is obtained which approximately corresponds to the line 2 with too high turbulence within the upper part of the dwelling zone 4. At the inflow of relatively warm supply air the flow pattern obtained is approximately according to line 3 with a substantially greater throw length and too high turbulence within the lower part of the dwelling zone.

When using a nozzle or inlet grill 5 according to the invention which comprises guide blades, bars, ribs or the like the angles of which relative to the flow direction are variable in response to the supply air temperature, a flow pattern according to FIG. 2 can be obtained where the line 6 indicates the flow for relatively cold air and line 7 shows how relatively warm air spreads in the room. In both these marginal cases, and of course also at supply air temperatures lying therebetween, the entire intense turbulence zone is kept outside the dwelling zone which, therefore, only gets treated with a desirable air agitation which in no way resembles a disturbing draught.

It can be advantageous in certain cases, in connection with said angle variation, also to reduce and, respectively, enlarge the flow area of the grill, possibly with considerable variations or simply with an increase or decrease in the different zones-of the grill. In this way it is possibly not only to obtain a highly uniform flow pattern irrespective of the supply air temperature, but also to direct smaller flows, for example, to zones to which heretofore the supply air preferably was not directed.

' The grill and its guide blades, bars, ribs or the like can be designed in many different ways, of which FIGS. 3-5 indicate one possibility and FIG. 6 indicates another. The grill proper may comprise, for example, a

rectangular frame 12 between two parallel sides of which extend, for example, guide bars or the like 8 of blade shape made of a suitable material, for example metal or plastic which can be bent or flexed to change the angular deflection of the air flow through the grill. The edges of the blades are fixed along the inside of the frame and the edges are free to be displaced along the outside of the frame, as indicated by the solid and broken lines 10 and 11. On these blades or the like, transverse to their longitudinal direction, are fastened bimetal strips 9 which, for example, in response to relatively cold supply air are straightened as shown at 10 in FIG. 3 and in response to relatively warm supply air assume positions as shown in broken lines at 11 in FIG.

. 3 the movements of the strips 9 in response to the tem The invention is not restricted to the embodiments described above and shown in the drawing, which embodiments are merely examples adapted to be modified in any optional way within the scope of the following claims.

The blades, for example, may be bimetal elements throughout. These blades may assume optional positions adapted to actual conditions and requirements. One can also provide a grill comprising some fixed and some movable guide blades. The angular positions of some guide blades, for example, may be controlled by the temperature and those of other guide blades be controlled by the air speed. it is also possible to combine with each other into one unit guide blades with temperature control and speed control and, respectively, fixed guide bars. In such a case, for example, a fixed guide blade a may be connected at its longitudinal edge facing the air flow with a temperature or speed controlled bar 11a as indicated to some extent in FIG. 6. in this way a control and a throttling effect are obtained simultaneously. The fixed bar, of course, may be replaced by a bar with temperature and speed control which, for example, acts in the opposed direction.

The invention is not restricted to the above-described embodiments but may be applied to a grid nozzle which may be intended for media other than air.

I claim:

1. An inlet grill for supplying gases with varying conditions for control of dwelling rooms, comprising a plurality of elongated blades disposed with their edges facing the supply of gas, said blades constituting guide bars for guiding the gas stream, characterized in that at least of some of the blades are automatically adjusted to different angles relative to the flow direction in response to the varying conditions of the supplied gas, said blades being made of a-material which can be bent or flexed to change the angular deflection of the gas stream through the grill, and including bimetal strips secured to said blades transverse to said edges to effect bending of said blades in response to temperature changes in the, gas stream.

2. A grill according to claim 1, characterized in that the automatic adjustment of the blades at least partly alters the flow area of the nozzle in connection with the change of the angle.

3. A grill according to claim 1 including fixed blades connected with said angularly adjustable blades.

4. A grill according to claim 3, characterized in that each of said fixed blades is connected at its longitudinal edge facing the supply with one of said adjustable additionally when supplied with relatively warm gas.

6. An inlet grill for supplying gases with varying conditions for control of dwelling rooms, comprising a plurality of elongated blades disposed with their edges facing the supply of gas, saidblades constituting guide bars for guiding the gas stream, characterized in that at least of some of the blades are automatically adjusted to different angles relative to the flow direction in response to the varying conditions of the supplied gas, and other of the blades are fixed and are connected with said angularly adjustable blades, said adjustable blades being of a bimetallic material which can be bent or flexed to change the angular deflection of the gas stream through the grill in response to temperature changes in the gas stream.

7. A grill according to claim 6, characterized in that the automatic adjustment of the blades at least partly alters the flow area of the nozzle in connection with the change of the angle.

8. A grill according to claim 6, characterized in that each of said fixed blades is connected at its longitudinal edge facing the supply with one of said adjustable blades.

9. An inlet grill for supplying gases with varying conditions for control of dwelling rooms, comprising a plurality of elongated blades disposed with their edges facing the supply of gas, said blades constituting guide bars for guiding the gas stream, at least of some of the blades being automatically adjusted to different angles relative to the flow direction in response to the varying conditions of the supplied gas, said adjustable blades being of a bimetallic material which can be bent or flexed to change the angular deflection of the gas stream through the grill in response to changes in the temperature condition of the supplied gas, characterized in that the blades are arranged to diverge at continuously increasing angles, from the center of the grill when supplied with relatively cold gas and that said diverging angles increase additionally when supplied with relatively 

1. An inlet grill for supplying gases with varying conditions for control of dwelling rooms, comprising a plurality of elongated blades disposed with their edges facing the supply of gas, said blades constituting guide bars for guiding the gas stream, characterized in that at least of some of the blades are automatically adjusted to different angles relative to the flow direction in response to the varying conditions of the supplied gas, said blades being made of a material which can be bent or flexed to change the angular deflection of the gas stream through the grill, and including bimetal strips secured to said blades transverse to said edges to effect bending of said blades in response to temperature changes in the gas stream.
 2. A grill according to claim 1, characterized in that the automatic adjustment of the blades at least partly alters the flow area of the nozzle in connection with the change of the angle.
 3. A grill according to claim 1 including fixed blades connected with said angularly adjustable blades.
 4. A grill according to claim 3, characterized in that each of said fixed blades is connected at its longitudinal edge facing the supply with one of said adjustable blades.
 5. A grill according to claim 1 wherein said blades are adjustable in response to the temperature condition of the supplied gas, characterized in that the blades are arranged to diverge at continuously increasing angles, from the center of the grill when supplied with relatively cold gas and that said diverging angles increase additionally when supplied with relatively warm gas.
 6. An inlet grill for supplying gases with varying conditions for control of dwelling rooms, comprising a plurality of elongated blades disposed with their edges facing the supply of gas, said blades constituting guide bars for guiding the gas stream, characterized in that at least of some of the blades are automatically adjusted to different angles relative to the flow direction in response to the varying conditions of the supplied gas, and other of the blades are fixed and are connected with said angularly adjustable blades, said adjustable blades being of a bimetallic material which can be bent or flexed to change the angular deflection of the gas stream through the grill in response to temperature changes in the gas stream.
 7. A grill according to claim 6, characterized in that the automatic adjustment of the blades at least partly alters the flow area of the nozzle in connection with the change of the angle.
 8. A grill according to claim 6, characterized in that each of said fixed blades is connected at its longitudinal edge facing the supply with one of said adjustable blades.
 9. An inlet grill for supplying gases with varying conditions for control of dwelling rooms, comprising a plurality of elongated blades disposed with their edges facing the supply of gas, said blades constituting guide bars for guiding the gas stream, at least of some of the blades being automatically adjusted to different angles relative to the flow direction in response to the varying conditions of the supplied gas, said adjustable blades being of a bimetallic material which can be bent or flexed to change the angular deflection of the gas stream through the grill in response to changes in thE temperature condition of the supplied gas, characterized in that the blades are arranged to diverge at continuously increasing angles, from the center of the grill when supplied with relatively cold gas and that said diverging angles increase additionally when supplied with relatively warm gas. 